<!DOCTYPE html>
<html lang='en'>

<head>
    <meta charset='UTF-8'>
    <meta http-equiv='X-UA-Compatible' content='IE=edge'>
    <meta name='viewport' content='width=device-width, initial-scale=1.0'>
    <title>Document</title>
    <script src='../../vue.js'></script>
</head>

<body>
    <div id='app'>
        <button @click="sortType=1">升序</button>
        <button @click="sortType=2">降序</button>
        <input type="text" v-model="search">
        <ul>
            <li v-for="item in newperson" :key="item.id">
                {{item.name}}--{{item.age}}
            </li>
        </ul>
    </div>
    <script>
        Vue.config.productionTip = false;
        const vm = new Vue({
            el: '#app',
            data() {
                return {
                    search: '',
                    person: [
                        { id: '001', name: 'laoli', age: 18 },
                        { id: '002', name: 'xiaoli', age: 28 },
                        { id: '003', name: 'dahuang', age: 22 },
                        { id: '004', name: 'ali', age: 32 },
                    ],
                    sortType: 0,
                }
            },
            computed: {
                newperson() {
                    //过滤
                    const filterResult = this.person.filter((item) => {
                        return item.name.includes(this.search)
                    });
                    // 排序
                    return filterResult.sort((a, b) => {
                        //sort排序原理:依次进入两个值,a是后边的值,b是前边的值
                        //当sort的回调函数返回负数 则交换两个值在数组中的位置
                        switch(this.sortType){
                            case 1:
                                return a.age-b.age;
                            case 2:
                                return b.age-a.age   
                        }
                    })
                }
            }
        })
    </script>
</body>

</html>